2. Which of the following organic solvents can be used in this experi- ment: eth

Question

2. Which of the following organic solvents can be used in this experi- ment: ethanol, acetone, diethyl ether, methylene chloride, acetic acid, acetonitrile? Explain (Hint: Look up the water solubilities of each compound in a reference book [e.g., the CRC Handbook of Chemistry and Physics or this lab manual, Table 6.1]before answering this question). 3. Compared to propanoic acid, is hexanoic acid (CH (CH2,COOH) more or less soluble in water? Explain. 4. Predict the solubility of propanoic acid in 5% NaOH solution. If r ) propanoic acid were dissolved in ethyl acetate, and you wanted to remove all of it from the ethyl acetate layer by extraction, which would beabetterextraction solvent, water or 5% sodium hydroxide? Explain. Calculate Kp using data items (d) and (e) for ethyl acetate. Suppose 5. 1 g of propanoic acid were dissolved in 50 mL of ethyl acetate and the acld solution extracted with 50 mL of water. How much propanolc would be left in the ethyl acetate layer? Extraction and Recryslization 57 6. In step 4 of this experiment, the propanoic acid was removed from the water layer by three successive extractions with a total of 30 mL of ethyl acetate. Was more or less acid removed from the water layer by three 10-mL successive extractions or by one single extraction using a 30-mL sample of ethyl acetate? Compare data items (d) and (3). Do the same for toluene by comparing items (dd) and (88) 7. Review the introduction of this experiment to answer this question: Assume you have a solution consisting of 1 g of phenol dissolved in 50 mL of water, and you extract it with two successive 25-mL portions of benzene. Calculate the mass of acid that will be removed from the water by each extraction. Is the total amount extracted more or less than what would be removed by one extraction with 50 mL of benzene?

Explanation / Answer

hexanoic acid is larger and even though polar,the H bonds with water wil be futher a part since the COOH is a part of 6C chain,so comparing to propanoic acid hexanoic acid is less soluble due to increasing nature of the hydrocarbon chains.

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